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js通过日期计算属于星期几

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07/25
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var arys1 = new Array();
arys1 = "2016-09-25".split('-'); //日期为输入日期，格式为 2013-3-10
var ssdate = new Date(arys1[0], parseInt(arys1[1] - 1), arys1[2]);
var week1=String(ssdate.getDay()).replace("0","日").replace("1","一").replace("2","二").replace("3","三").replace("4","四").replace("5","五").replace("6","六")//就是你要的星期几
var week="星期"+week1； //就是你要的星期几